/*
 *  sha1.h
 *
 *  Description:
 *      This is the header file for code which implements the Secure
 *      Hashing Algorithm 1 as defined in FIPS PUB 180-1 published
 *      April 17, 1995.
 *
 *      Many of the variable names in this code, especially the
 *      single character names, were used because those were the names
 *      used in the publication.
 *
 *      Please read the file sha1.c for more information.
 *
 */

#ifndef _SHA1_H_
#define _SHA1_H_

#include <stdint.h>

#ifndef _SHA_enum_
#define _SHA_enum_
enum {
    shaSuccess = 0,
    shaNull,         /* Null pointer parameter */
    shaInputTooLong, /* input data too long */
    shaStateError    /* called Input after Result */
};
#endif
#define SHA1HashSize 20

/*
 *  This structure will hold context information for the SHA-1
 *  hashing operation
 */
typedef struct SHA1Context {
    uint32_t Intermediate_Hash[SHA1HashSize / 4]; /* Message Digest  */

    uint32_t Length_Low;  /* Message length in bits      */
    uint32_t Length_High; /* Message length in bits      */

    /* Index into message block array   */
    int_least16_t Message_Block_Index;
    uint8_t Message_Block[64]; /* 512-bit message blocks      */

    int Computed;  /* Is the digest computed?         */
    int Corrupted; /* Is the message digest corrupted? */
} SHA1Context;

/*
 *  Function Prototypes
 */

int SHA1Reset(SHA1Context *);
int SHA1Input(SHA1Context *, const uint8_t *, unsigned int);
int SHA1Result(SHA1Context *, uint8_t Message_Digest[SHA1HashSize]);

#endif
